(Thia) cycloalkyl[B]indole compounds as anti-inflammatory agents

A compound selected those of formula (I):

• ##STR28## in which:
• R.sub.1 represents Ar--(CH.sub.2).sub.n --O-- wherein n represents zero or 1 to 4 inclusive and Ar is selected pyridyl, quinolyl, isoquinolyl, Ar being unsubstituted or substituted by one or more radicals selected from halogen, alkyl, alkoxy, hydroxy and trifluoromethyl;
• R.sub.3 is selected from carboxyalkyl and alkoxycarbonylalkyl;
• and
• A represents --(CH2)m-- wherein m is 3-6 inclusive, or represents a group of formula (.alpha.):
• ##STR29## in which p is 1-4 inclusive;
• wherein the terms "alkyl" and "alkoxy" denote linear or branched groups having 1 to 6 carbon atoms inclusive,
• their optical isomers, in pure form or in the form of a mixture,
• and their pharmaceutically-acceptable addition salts with an acid or a base.